An asteroid woth mass = 1.00 x 109 kg comes from deep space, effectively from infinity, falls toward the Earth.
Find the change in potential energy when it reaches a point 4.00 x 108 m from the center of the earth. In addition find the work done by the force of gravity.
"\\Delta U=U_2-U_1,"
"U_1=0,"
"U_2=mgd,"
"\\Delta U=4\\cdot 10^{18}~J,"
"A=\\Delta U=4\\cdot 10^{18}~J."
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